TL431 / TL431A / TL431B
TM
®
Precision programmable References
P
RODUCTION
D
ATA
S
HEET
APPLICATION INFORMATION
R (see Note)
V
BATT
R1 0.1%
I
K
V
O
V
BATT
WWW .
Microsemi
.C
OM
V
REF
TL431/A
& TL431
B
R2 0.1%
Input
V
O
=
⎜
1
+
⎛
⎝
⎟
•
V
REF
R2
⎠
R1
⎞
F
O
O
R
DU
N
E
C
W
T
D
E
V
BATT
Figure 16 –
Shunt Regulator
Note: R should provide > 1mA cathode current to the TL431/A & TL1431 at
minimum V
BATT
V
BATT
R1
V
O
Figure 17 –
Single-Supply Comparator with Temperature-
Compensated Threshold
V
O
P
R
R1
TL431/A
& TL431B
R2
TL431/A
& TL431B
EC
S
OM
OL
ME
ET
ND
E
ED
R2
⎟
•
V
REF
R2
⎠
Figure 18 –
High Current Shunt Regulator
12V
R1A
R3 (see Note)
V
O
=
⎜
1
+
⎛
⎝
R1
⎞
Figure 19 –
Crowbar Circuit
Note: Refer to the stability boundary conditions in Figure 15 to determine
allowable values for C.
TL431/A
& TL431B
O
B
R
R4
(Note)
V
BATT
I
O
R2A
R2B
T
TL431/A
& TL431B
SI
GN
S
TL431/A
& TL431B
V
O
V
ON
2V
V
OFF
V
BAT
T
GND
C
(see Note)
A
PPLICATIONS
A
PPLICATIONS
N
O
⎛
R1B
⎞
Low Limit
=
⎜
1
+
⎟
•
V
REF
⎝
R2B
⎠
⎟
•
V
REF
R2B
⎠
LED on when Low Limit < V
BATT
< High Limit
Figure 20 –
Voltage Monitor
Note: R3 and R4 are selected to provide the desired LED intensity and > 1mA
cathode current to the TL431/A & TL431B at the available V+
R
S
0.1%
High Limit
=
⎜
1
+
⎛
⎝
R1B
⎞
Figure 21 –
Precision Contact – Current Sink
Copyright
©
1999
Rev. 1.4, 2006-09-26
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
MICROSEMI [ MICROSEMI CORPORATION ]
